John felt a little disappointed and was about to leave, ______ something occurred which attracted his attention.

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问题 John felt a little disappointed and was about to leave, ______ something occurred which attracted his attention.

选项 A、while
B、when
C、until
D、unless

答案B

解析 连接词辨析题。根据结构判断,空格前后的分句之间为并列关系,这两个分句表达的是几乎同时发生的时间关系,四个选项中只有when既可以表示并列关系,又可以表示时间关系;while虽然可以作并列连词,但是强调转折关系,表示“然而,却”,相当于whereas。
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